Semis took another global hit, and Korea was hit hard. The Kospi dropped as much as 6.2%, has slipped under its 200-day moving average, and is now roughly a third below its June peak. Shares of Samsung Electronics and SK Hynix each fell more than 7% on Tuesday, putting them on track for a fifth consecutive loss. The slump followed weakness in US chip names overnight, with memory peer Micron Technology down 3.9%.
Investors seized on news that China's CXMT Corp. had progressed toward a novel memory design that Samsung and SK Hynix are likewise targeting, heightening fears of Chinese rivalry. According to the South China Morning Post, CXMT is targeting the launch of a server memory offering by the end of 2026 that would increase storage density.
Add to that broader doubts about how durable the AI boom really is. Broadcom CEO Hock Tan argued that financing could pose a bigger challenge than a lack of chips. Speaking in Singapore, he added, "A lot of investors have no clue what they are investing in." They "set very extreme expectations only to find out that it's almost like they are in a casino."
Competitive pressure in memory reshapes an entire national export base. Market Briefs covers that trade free every weekday.
"Uncertainty over whether the upcycle can last into 2028 and beyond appears to be weighing on valuations and share prices" for Korean chipmakers, noted Ha SeokKeun, Eugene Asset Management's chief investment officer.
"Samsung's strong earnings have been overshadowed by concerns about future competition from CXMT and the sustainability of AI spending," observed Jung In Yun, the chief executive officer of Fibonacci Asset Management Global. "These concerns may weigh on sentiment, but CXMT still needs to translate technological progress into commercially competitive production at scale."
This year's earlier rally in Korean stocks has faded as the market's dependence on its two chip leaders cuts both ways. Even record earnings from Samsung last week did not lift the stock, with investors worried growth could cool. The Kospi now sits under its 200-day moving average and remains roughly one-third beneath its June record. Foreign investors accelerated withdrawals in October, selling over $6 billion net in Kospi equities.
When one industry powers a market, every headline can jolt your portfolio. Korea's chip-heavy setup means swings tied to AI spending, comments from industry leaders, and Chinese competition can echo fast. If you have exposure to memory and AI beneficiaries, today shows how strong results can still be overshadowed by questions about what comes next.
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